[clug-talk] nasty problem

[Gustin Johnson]

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Shawn wrote:
> On Thursday 18 May 2006 00:20, Gustin Johnson wrote:
>> Why are you using UDP instead of TCP?  Since your app is going over
>> 
> 
> Rob has talked to me about this app in the past.  The 12 minute
> response time

12 Minutes?  Satellite serviced sites in Africa don't have that kind of
latency.

> he might sometimes get via the satellite, was a factor.  (i.e. that
> could be a 36 minute handshake in the worst case scenario - 3
> packets, each of which could take up to 10 or 12 minutes to
> arrive...)  Basically, he's dealing with an environment with very
> high latency issues.  TCP packets would timeout much too quickly for
> this environment.

Without knowing more it is difficult to help any further.  Hopefully the
sites I listed earlier give him a good place to start.

Years ago, when I was working at Shaw, I wrote a php front end to a
number of common *NIX utilities to help troubleshoot weird problems.  It
occurred to me on the way home that this is one approach to tracking
down the problem.  Have a web front end to control the traffic
generating apps that are at his home/office, and a laptop to log the
data in the field (ssh can be a pain over high latency links, its why I
wrote the php front end in the first place).


> Now, take what I've said with a grain of salt.  Rob is THE source for
> details here.  Our conversation on this happened sometime last fall
> (I think), so my memory could be spotty.
> 
> Shawn
> 
> 
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